General Chemistry

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166 Uranium eventually decays into a stable isotope of :

A
Radium
B
Thorium
C
Lead
D
Polonium

167 Where does the oxygen that keeps us alive come from?

A
Carbon dioxide
B
Carbonates absorbed from soil
C
Oxides of minerals
D
Water

168 The iron ore which contains 72% of iron is :

A
Magnetite
B
Limonite
C
Haematite
D
Siderite

169 The anode of a dry cell is made up of :

A
Iron
B
Cadmium
C
Zinc
D
Lead

170 The anode in a dry cell consists of :

A
Copper
B
Zinc
C
Cadmium
D
Graphite

171 Milk is a colloidal system in which:

A
Water is dispersed in fat
B
Fat is dispersed in water
C
Fat and water are dispersed in each other
D
Fat is dissolved

172 Which among the following is pure matter ?

A
Carbon–dioxide
B
Brass
C
Air
D
Iron

173 Domestic cooking gas consists mostly of :

A
methane and ethane
B
liquified butane and isobutane
C
hydrogen and acetylene
D
ethylene and carbon monoxide

174 The acid which is secreted by the glands in the stomach wall is :

A
sulphuric acid
B
hydrochloric acid
C
nitric acid
D
phosphoric acid

175 Muscle fatigue is caused by the accumulation of :

A
Pyruvic acid
B
Lactic acid
C
Oxalacetic acid
D
Uric acid

176 The acid present in red ants is :

A
Acetic acid
B
Butyric acid
C
Caproic acid
D
Formic acid

177 The wire of flash bulb is made of :

A
Copper
B
Barium
C
Magnesium
D
Silver

178 When quick lime is added to water

A
heat is liberated
B
heat is absorbed
C
temperature decreases
D
no heat change takes place

179 Which one of the following elements is least likely to be found in commercial fertilisers?

A
Nitrogen
B
Phosphorous
C
Potassium
D
Silicon

180 Name the particle that is most essential to continue the chain reaction during the fission of uranium-

A
Electron
B
Proton
C
Neutron
D
Positron